JPH05508353A - Electric hand-held machine tools, especially angle grinders - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

electric handheld machine tool, Especially the angle grinder Background technology The invention relates to an electric hand-held machine tool of the type defined in the generic part of claim 1; Especially starting with an angle grinder. These types of handheld machine tools, especially angle grinders, are very popular today. It has an on-off switch. This on-off switch is a switch strip. operated via the This switch strip is located on the underside of the handgrip. with the handgrip held and operated with at least one finger. When working with the hand-held machine tool, it is maintained in an operated state. C The ergonomic configuration of the handgrip, e.g. The tilt angle is optimized for a single working position of the machine tool. similar The same can be said about the arrangement of switch strips. switch strip hashiba It is equipped with a switch interlock and a switch lock. Tarock and switch lock actuate quickly and reliably in said working position be able to. Some hand-held machine tools perform various work strokes in more than one work position. used for. For example, in addition to grinding or roughing, angle grinders can also be used for cutting. It is also used for cutting work, for example cutting stone slabs. The optimum working position mentioned above is usually given for the roughing working position, and this In this position, the grinding wheel is facing downward. In other words, the grinding wheel becomes the switch strip. This means that they are located almost parallel to each other. On the other hand, during cutting work, the The grinder is rotated 90” left or right about its longitudinal axis. The cutter disc is positioned almost perpendicular to the workpiece. . Due to this rotational movement, the handgrip, together with the switch strip, The hand holding this switch strip is in an inconvenient position. Ann When the Guru Grinder is rotated to the left and the handgrip is grasped with the right hand, The switch strip is located on the thumb, or the bulge at the base of the thumb. When the angle grinder is rotated to the right and held in the right hand, the switch The trip cannot be operated unless it is held using the thumb. In both cases Also, a reliable and fatigue-free holding of the switch strip is not possible. moreover, In case of danger, the position of the switch interlock and switch lock can be used to quickly Inability to perform quick reaction and shutoff. In order to avoid the above-mentioned drawbacks, known angle grinders are equipped with a grinding wheel and a cutter. The gear head with tool storage for the data disc is located on the motor casing. It is arranged in a removable manner. Loosen the four fixing screws and insert these fixing screws into the holes. After removing the transmission head from the motor casing centering device, Can be rotated by ° to the right or left. Then reinstall the fixing screw and attach the transmission head to the motor casing. The tightening can be fixed. Minute of transmission head in motor casing Since the solution and new assembly are relatively time-consuming, the above-mentioned known angle grinder is inappropriate for use cases where it must be adjusted relatively frequently. be. Advantages of invention An electric hand-held machine according to the invention according to the characterizing part of claim 1, in particular an angular machine Lugrinders have the advantage of being easy and quick to handle. Clan After releasing the locking device and the locking device manually, that is, without tools, remove the tool. Advantageous correspondence between part #1 and the switch strip with respect to the new machine working position the handgrip or transmitter in the motor casing until the The moving device head can be rotated. The locking device is then activated again. and the clamping device is operated. The locking device and clamping device allow the operator to Optimum safety can be obtained. This is because the motor casing Relative rotation of the handgrip or transmission head to the On the other hand, a rigid connection between movable components relative to each other is provided. Because there is. Both devices are realized in a structurally simple and space-saving manner. It is also not sensitive to dirt or dust. By the means described in claim 2 et seq., a hand-held machine according to claim 1, in particular Advantageous improvements to the grinder are possible. In an advantageous embodiment of the invention, the clamping device is realized particularly advantageously, in which case the clamping device is The grip or transmission head has a shell-shaped casing, which The housing is a radially protruding collar that fits into an annular groove in the motor casing. the clamp is engaged and has a longitudinal slit in the region of the collar; The device has a tensioning screw extending transversely to the longitudinal slit; The tensioning screw can be screwed onto the thread by means of a tensioning lever, so that the longitudinal The casing range formed on both sides of the slit reduces the width of the longitudinal slit They will be able to approach each other while doing so. This allows the previous The collar is radially clamped into an annular groove provided in the motor casing. In another embodiment of the invention, between the tensioning screw provided on the locking device and the tensioning lever, A tooth coupling is provided, which tooth coupling is attached to the axis of the coupling part. Can be canceled by directional movement. This allows the clamping force of the tightening screw to be adjusted later. The clamping lever is always accurately defined in its clamping position. It will now take the specified end position. In a further advantageous embodiment of the invention, a locking device is advantageously implemented. in this case , the motor casing is provided with a number of locking grooves corresponding to the number of required machine working positions. These locking grooves are shifted by an appropriate rotation angle, and the shell case A locking protrusion is rotatably arranged on the thing, and the locking protrusion is arranged in the locking groove. Each can be positively engaged with one another. In a further advantageous embodiment of the invention, a forced coupling of the locking device and the clamping device is provided. You will get pulling. In this case, the locking projection is a cup that coaxially surrounds the tensioning screw. It is attached to the pulling sleeve so that it cannot rotate relative to the coupling sleeve. itself is made through a pawl coupling to one of the coupling parts of the tooth coupling. For combined use. In this way, the clamping device and the locking device form a single component unit. When combined into a set, the following five benefits can be obtained. That is, only one operating level There is only a bar, which (apart from easier handling) Lock always lacks tension, and conversely, tension always accompanies lock. . Unlike when the locking device and clamping device are configured separately, each switching Later on, you no longer have to check separately whether both devices are activated. Ru. In yet another configuration of the present invention, the locking groove and the locking protrusion of the locking device are provided with a breaking contact. One contact element is arranged in each case, and this breaking contact is Electricity between an on-off switch operated by a lip and an electric drive motor when the locking protrusion is engaged in the locking groove. It is configured so that it can only be closed. This allows the hand grip or When adjusting the gear head, the electrical circuit to the electric motor is interrupted. the electrical circuit is formed only after it has been properly locked and tightened again. It is guaranteed that this will not happen. drawing In the following, embodiments of the invention will be explained in detail with reference to the drawings. Figure 1 shows a side view of an electric angle grinder. Figure 2 shows the hand grip and motor casing of the angle grinder shown in Figure 1. It shows a partially sectional side view of the FIG. 3 shows a cross-sectional view taken along line III-III in FIG. FIG. 4 shows a plan view of the handgrip shown in FIG. FIG. 5 shows a cross-sectional view similar to FIG. 3 of an angle grinder according to another embodiment. and FIG. 6 shows a longitudinal cross-sectional view along line VI-VI in FIG. Figure 7 shows the hand grip and casing of the angle grinder according to the third embodiment. Shows the number of views with the division, FIG. 8 shows a cross-sectional view taken along line VIII-VIII in FIG. 7. Description of examples This is an example of a general electric hand-held device shown in side view in Figure 1. The electric angle grinder houses an electric drive motor (not shown) It has a motor casing 10. One casing of this motor casing A rad 11 is provided on the end face to project to the transmission device, and on the other end face of the casing, Handgrip 12 follows. At the end of the transmission head 11 there is a tool receptacle. 13 is accepted. A grinding wheel 14 is held in this tool accommodating portion. This whetstone The stone wheel is used for rough cutting purposes in the position shown by the solid line and is rotated by 90°. In the position indicated by the dashed line, it is used for cutting purposes. hand grip 12 has a handle grip 15, and this handle grip uses an angle grinder. gripped by hand during work. The hand grip 12 further includes the handle grip 12. The yoke 16 has a yoke 16 integrally molded with the cup, and this yoke has a through opening 1 on the lower side. It straddles the handle grip 15 so as to leave 7, and it is made using an angle grinder. During work, protect the fingers placed around the handle grip 15 from below. It has become so. On the lower surface of the handle grip 15 facing the yoke 16, there is a switch. A switch strip 18 projects into the through opening 17. This switch strip operates an on-off switch for electric motors. . The transmission gear head 11 is rigidly and preferably integrally connected to the motor casing 10. ing. On the other hand, the hand grip 12 is relative to the motor casing lO. A locking device and a clamping device are rotated and operated by a tensioning lever 19. It can be fixed in place on the motor casing 10 in a defined rotational position by means of a positioning mechanism. As can be seen in particular from FIG. 2, the hand grip 12 has a shell-like casing. (hereinafter referred to as shell casing 20). This shell casing In order to rotatably hold the hand grip 12 on the motor casing 10, An annular groove 22 provided in the motor casing 10 with a radially projecting collar 21 is engaged in. 11) in the collar area 21, the shell casing 20 is It has a slit 23 (FIG. 3), which longitudinal slit is connected to the clamping device. 24 to tighten the collar 21 at the bottom of the annular groove 22 in the radial direction of both hands. enable. Due to manufacturing technology reasons, the shell casing 20 consists of two half-shells. Shika 1 etc. are manufactured. These half shells are connected by three screw connections 25. combined. Figure 3 is No. 2, both half shells 201, 202, and screw joints. One of 25 is recognized. The longitudinal slit 23 is located in front of the shell casing 20. Butt the two half shells 201 and 202 on the upper surface of the side opposite to the yoke 16. Part number two is formed. The clamping device 24 has a tensioning screw 26. This tightening screw has a longitudinal slot. 23 extending transversely to the casing axis, one half shell It passes through the hole 27 provided in the shell 201, and the force (force) is also applied to the other half shell 202. It can be screwed into a threaded hole 28 provided therein. Operation of the tightening screw 26 ( This is carried out by No. 19 (details will be explained later). said threaded hole 28 of the tightening screw 26;

[The opposite end is firmly connected to the first cup 1 non-length portion 31 of the tooth coupling 30. This first cup 1 non-section is supported via a coupling sleeve 29 in the wall area surrounding the hole 27, and is supported by an outer recess 33 provided in the half shell 201 in this wall area. It is formed. The first coupling part 31 supports a ring gear with radially projecting coupling teeth 34 in its reduced diameter section. Before These coupling teeth mesh with similar coupling teeth 34 of a ring gear provided in a second coupling part 32 coaxially surrounding the first coupling part 31. The second coupling part 32 is formed integrally with the tensioning lever 19. It is. This tensioning lever projects perpendicularly from the second coupling part 32 and extends laterally of the shell casing 20. A pin 35 is screwed into the first coupling part 31 on its end face and has a pin flap 36 . A compression spring 38 is supported between the collar 36 and an annular web 37 provided inside the hollow cylindrical coupling part 32 . The tight length of the compression spring 38 and the axial length of the coupling tooth 34 are matched to each other, in which case the tensioning lever By pulling the bar 19 away from the shell casing 20, the engagement of the coupling teeth 34 of the first coupling part 31 and the second coupling part 32 is reduced. A locking device 40, which allows the second coupling part 32 to be moved axially until the engagement is released, allows the handgrip 12 to be attached to the motor casing 10 in various rotational positions, i.e. in FIGS. 1-3. deviated by 90' from the basic position shown in It is possible to fix the position in two rotational positions. These rotational positions are From the basic position, move the grip 12 to the left side or around the casing longitudinal axis. can be adjusted by rotating to the right. For this purpose, the motor casing The ring 10 supports three casing bins 41, 42, 43 offset from each other by 90". These casing bins project radially inwardly and each have a locking groove 44. The arc-shaped web 52 allows three casings to be connected. webs 41, 42, 43 are connected to each other, in which case said webs 5 These casings are provided at the free ends of the casing bins 41, 42, and 43, respectively. - integrated with single bin. The locking grooves 44, 45, 46 cooperate with the locking projections 47. This locking projection can be pivoted positively into the locking groove 44 , 45 , 46 in order to secure the handgrip 12 in the motor housing 10 . A locking protrusion 47 (the shape of which can be seen in FIG. It is attached to the screw 26 so that it cannot rotate relative to it. an annular ring surrounding the first coupling portion 31 of the toothed coupling 30; The web 39 has a catch 48 with a pawl coupling 50. Kono Tsume Cuplin The toothed coupling 30 cooperates with a corresponding pawl 48 provided on the end face of the second coupling part 32 of the toothed coupling 30. A pawl 48 provided on the coupling sleeve 29 and the second coupling part 32 is provided with a $2 cap for the purpose of releasing the toothed coupling 3o. The pawls 48 are configured in such a way that even if the coupling part 32 is moved in the axial direction, the pawls 48 remain engaged with each other, ie, the pawl coupling is not released in this case. In order to clamp and lock the handgrip 12 to the motor casing 10, the handgrip is rotated so that the locking projections 47 fit into the locking grooves 44, 45 . 46. The tensioning lever 19 is then pivoted downwards in the direction of the arrow 49 from the position shown in broken lines in FIG. During this turning movement, the pawl coupling 50 is used. The coupling sleeve 29 is rotated, and the locking protrusion 47 is rotated. Turn it to enter the corresponding locking groove 44, 45, 46. On the other hand, the tensioning screw 26 is rotated via the toothed coupling 30 and is screwed deeply into the threaded bore 28, so that the two half-shells 201, 202 of the shell casing 20 are moved together. the width of the longitudinal slit 23 is reduced. Due to this movement of the two half-shells 201, 202 in the area of the longitudinal slit 23, the collar 21 of the shell casing 20 moves against the motor casing. The hand grip is pressed radially to the bottom of the annular groove 22 provided in the thing 10. 12 is clamped to the motor casing 10. At the end of the swivel movement, the tension lever The bar 19 abuts against a stopper 51 arranged outside the shell casing 20. In this end position of the tensioning lever 19, the locking projection 47 is fully pivoted into the corresponding locking groove 44, 45, 48. The tightening of the tensioning screw 26 is carried out in order to adjust the force by moving the tensioning lever 19 axially away from the shell casing 20 until a stop is provided by the compression spring 38 being tightened to its tight length. must be pulled in the direction. In this position, the teeth 34 of the toothed coupling 30 are disengaged and the tensioning lever 19 is separated from the tensioning screw 26. Since the pawl coupling 50 remains closed, the connection between the locking projection 47 and the tensioning lever 19 is maintained. The tension lever 19 that has been disconnected from the tension screw 26 is moved away from the stopper 51 in the direction of the arrow 49. The robot is rotated slightly backwards in the direction in which it moves, and then released again. When the tensioning lever is released, the tensioned compression spring 38 re-engages the two coupling parts 31, 32 of the toothed coupling 30, and the tensioning lever 19 and the tensioning screw 26 are again mutually fixedly interlocked. is combined with The tension lever 19 contacts the stopper 51 again in the direction of the arrow 49. the tension screw 26 is further screwed into the threaded hole 28. Ru. The relative position of the hand grip 12 and the motor casing lO shown in FIG. In the position where the locking protrusion 47 is engaged with the locking groove 44 in the middle, the angle The working position is given when the grinder is used for roughing purposes. Cutting work For operation, the clamping device 24 and the locking device 4o must be released using the II constant lever 19 and the handgrip must be rotated by 90” towards the right or left; this rotational movement is caused by the movement of the motor casing. Two stopper protrusions 53 and 54 provided inside the shell casing 2° and a stopper protrusion 53 provided inside the shell casing 2°. It is limited by the upper projection 55. The stopper protrusion 53 or 54 When abutting against the riser 55, the locking protrusion 47 aligns with the locking groove 45,46. in this position Then, by operating the tensioning lever 19, the handgrip 12 is locked to the motor casing 10 as described above, and the tightening is fixed. In all other relative positions of the handgrip 12 with respect to the motor casing 10, the locking abutment A raised part 47 is located immediately in front of the arched web 52, thereby providing a locking projection. Since the lever 47 cannot be pivoted, actuation of the tensioning lever 19 is prevented. The tensioning lever 19 then assumes the middle position shown in broken lines in FIG. The area shown in Figure 4 As can be seen from the plan view of the handgrip 12, in this position the tensioning lever 19 projects significantly towards the handle grip 15, thereby preventing the handler grip 15 from being gripped by the hand. The user of the angle grinder thereby notices that the handgrip 12 is not locked and tensioned in the motor casing LO in an orderly manner; in the plan view of FIG. The pawl coupling 50 between the coupling part 31 and the coupling sleeve 29 is clearly visible. In the embodiment of the angle grinder shown in FIGS. 5 and 6, the clamping device 124 and the locking device 140 are constructed separately from each other and must be operated separately. This makes handling a little more difficult, but this structure This method is more advantageous in terms of manufacturing costs. The clamping device 124 is unchanged! Clamping device 24 shown in Figure 3 and one I will. The first coupling part 31 of the toothed coupling 30 is replaced by a shell casing, since the coupling sleeve surrounding the tensioning screw 26, which is a component of the locking device 40 shown in FIG. 3, is no longer required. It is supported directly on a wall section of a recess 33 provided in 20. Therefore, the same structure Components are indicated by the same symbols as in the third @. The locking device 140 extends diametrically from the yoke 16 to the clamping device 124. It is arranged at the forward transition of the hand grip 12 to the handle grip 15. Half portion A locking lever 57 is rotatably supported on a bearing pin 58 on a bearing sleeve 56 which is integrally arranged on the lever 201 . One lever arm of the locking lever 57 is designed as an operating key 59, whereas the other lever arm forms a locking projection 147. The locking lever 57 is arranged in a notch 61 provided in the yoke 16. The operating key 59 protrudes from the notch 61 provided in the yoke 16 (FIG. 6). In this case, the locking protrusion 147 is It engages with one of three locking grooves 144, 145, 146 arranged on the outside of the motor casing 10. Locking grooves 144, 145 146 are also offset from each other by 90°, so that the handgrip 12 can be similarly rotated and locked and tightened in a similar rotational position. When the pivot position is obtained, the locking protrusion 147 automatically engages with each locking groove 144, 145, 146 based on the action of the bending spring 60, so all that is left is to move the tension lever 19 in front. Two different levers are actuated only when releasing the clamping device 24 and the locking device 140, which only need to be actuated as explained. In another embodiment of the angle grinder shown in FIGS. 7 and 8, the hand grip The yoke 216 of the top 12 also serves as a tensioning lever for synchronously operating the clamping device 224 and locking device 240. For this purpose, The arc 216 is pivotably held at one end in two bearing pins 62,63. These bearing pins each project inwardly from the half-shells 201, 202 of the shell casing 20 and are aligned with one another. The other end of the yoke 216 is removably fixed to the handle grip 15 by a snap fastener 64 (FIG. 7). The clamping device 224 (FIG. 8) also has a tensioning screw 26, which The same extends through a hole 27 provided in the half-shell 20 on the one hand, and can be screwed into a threaded hole 28 provided in the other half-shell 202 on the other hand. In this case, the hole 27 is arranged coaxially in one bearing pin 62 and the threaded hole 28 in the other bearing pin 63. A coupling sleeve 229 is also rotatably mounted on the tensioning screw 26 and is connected to the yoke 216 in a relatively rotationally fixed manner. The coupling sleeve 229 is arranged on the end side. is operatively connected to a toothed coupling 230. A hollow cylindrical cup The pull release member 65 has an integral mushroom-shaped grip 66 at its free end and surrounds a screw head-like section 67 of the tensioning screw 26. A bottle 35 is screwed into this section on the end face and has a bottle flap 36. The collar 36 and the annular wafer provided inside the coupling release member 65 A compression spring 38 is supported between the spring 37 and the spring 37 . The axial length of the coupling teeth of the toothed coupling 230 and the contact length of the compression spring 38 are also matched to each other, in which case the coupling release member 65 resists the spring force of the compression spring 38. By being pulled out, the coupling teeth of the toothed coupling 230 are first disengaged, and then the compression spring 38 is tightened to a tight length, thereby locking the axial shift of the coupling release member 65. It has become. The decoupling element 65 is connected to said section 67 of the tensioning screw 26 in a relatively rotationally fixed manner via a pawl coupling 250 . In this case, the pawl coupling 250 is configured in such a way that even if the tooth coupling 230 is released, the relative rotationally fixed connection is maintained. The locking device 240 and the clamping device 224 are forcibly coupled and can be operated simultaneously via the yoke 216. For this purpose, a locking protrusion 247 (FIG. 7) is formed on the free end of the yoke 216 that protrudes beyond the center of gravity. It is. This locking projection can be pivoted into three locking grooves 24 4, 245, 246 provided in the motor casing 10. The engagement grooves 244, 245, and 246 are also provided in the motor casing 10. Single bins 241, 242, 243 are provided, which project into the interior of the casing offset by 90[deg.] and are connected to one another by arc-shaped webs 52. The yoke 216 is attached to the snap fastener 64. When the handle grip 15 is fixed in position, the locking projection 247 is positively engaged with one of the three locking grooves 244, 245, 246. snap fa When the yoke 216 is pivoted in the direction of the arrow 249 to the position shown in broken lines in FIG. It is pivoted outward. Another safety measure is the provision of a disconnect between the on/off switch 68 (FIG. 7) for the electric drive motor of the angle grinder, which is operated by the switch strip 18, and said electric motor. Contact points 69 are arranged. This blockade At the disconnection point, the yoke 216 must be secured to the handle grip 15 with the snap fastener 64. The locking projections 247 are arranged in each locking groove 244 so that the locking projections 247 can only be closed when the locking projections 247 are pivotally engaged in one of the three locking grooves 244, 245, 246. , 245, 246, the cut-off contact 69 is automatically opened and any power supply to the electric drive motor is cut off. In order to realize such a breaking contact 69, two contact springs 71, 72 are arranged in each locking groove 244, 245, 246. These contacts The spring is installed on the locking protrusion 247 when the locking protrusion 247 is pivoted. They are connected to each other via a contact bridge 70 with two lateral contact surfaces 73 that are cut out. One contact spring 71 provided in all three engagement grooves 244, 245° 246 is connected to the first insertion contact 74. The other three contact springs 72 of the engagement grooves 244, 245, 246 are connected to the second insertion contact 75. The first plug contact 74 is connected to the output side of the bipolar on/off switch 68, while the second plug contact 75 is connected to the current brush of the electric drive motor. It is continued. The manner of operation of the forcibly coupled locking device 240 and clamping device 224 is as described with reference to FIGS. 311-3. After the snap fastener 64 is released, the yoke 216 is pivoted in the direction of the arrow 249, and the locking protrusion 247 is pivoted out of the locking groove 244, and at the same time the electric drive motor is supplied. Electricity will also be cut off. As the yoke 216 pivots, the tensioning screw 26 is further advanced from the threaded hole 28 via the coupling sleeve 229, the tooth coupling 230, the coupling release member 65, and the pawl coupling 250. The clamp connection between the collar 22 provided on the motor casing 20 and the annular groove 22 provided on the motor casing 10 is released.Then, move the hand grip 12 by 90'' to the left or right to perform a new operation. It can be rotated to any position. Wear. Thereafter, the yoke 216 is pivoted back again and locked onto the snap fastener 64. In this case, the locking projection 247 pivots into the corresponding locking groove 245 or 246, and the contact bridge 70 provided on the locking projection 247 The contact springs 71 and 72 are connected, and the cutoff contact 69 is closed. The same (toothed coupling) is provided by a coupling sleeve 229 rotating together with the yoke 2 The tensioning screw 26 is rotated through the ring 230 and the pawl coupling 250 and screwed deeper into the threaded hole 28. As a result, the two half shells 201, 202 are clamped to the motor casing IO as explained above. nine Post-adjustment of the ramp force is achieved by means of a coupling release member 65 with a mushroom-shaped grip 66. It is possible. This coupling release member is pulled against the spring force of the compression spring 38. It can be stretched. Moreover, in this case, the coupling release member is In the direction away from the thing 20, the compression spring 38 is compressed to the tight length. can be pulled until a stop is applied. In this position, the teeth The pull 230 is released and the yoke 216 can be pivoted back slightly without rotation of the locking screw 26. Upon release of the mushroom-shaped grip 66, the compression spring 38 forms a relatively non-rotatable connection between the yoke 216 and the tensioning screw 26 via the toothed coupling 230. Yoke 216 can again be secured to snap fastener 64. In this case, the tensioning screw 26 is screwed deeper into the threaded hole 28 and the clamping force is increased. The present invention is not limited to the above embodiments. In other words, the hand grip is The gear head is firmly connected to the motor casing and the gear head rotates with the motor casing. The clamping device and the locking device may be connected in a rotatable manner, in which case the clamping device and the locking device must be located between the mounting head and the motor casing. Special table 15-508353 (11) (j [Figure 3). International search report International search report -I 幀-佽一 ``-一一輌-II・佽-一种-sw chat-佽一忰一一一- 1--- 幀幀-佽一一 ``-１一佌-II・佽-一次-SW chat- 佽一忰一一一- １---- groaning sails Tkmaa- ふう１clear--- -佽MU-糟P璽ω-10P佽axis II/ 咋〜 Blind Tka Ewepem Pms* 01nee m-+w wq-fy km p+wtiewm* meek we -1drunkgmm 1m@k-11d -Takoichiichitun

Claims (1)

[Claims] 1. Electric hand-held machine tools, especially angle grinders, with electric drive A motor casing that houses a moving device and a mechanical structure protruding from one end of the casing. A transmission head supporting the tool receptacle and a transmission head provided following the other casing end face. a handgrip is provided, and the handgrip is provided with a rotating handgrip of the drive device. In the form of an ergonomically arranged switch strip for closing the in which the handgrip (12) or the transmission head (11) is connected to the motor. rotatably retained in the casing (10) in at least two rotational positions; , the motor casing is locked by a manually operable locking device (40; 140; 240). Clamp that can be locked against relative rotation to the clamp (10) and can be manually operated. can be tightened to the motor casing (10) by means of a device (24; 124; 224); An electric hand-held machine tool that is characterized by: 2. The handgrip (12) or the transmission head (11) is a shell-shaped case. casing (20), the casing having a radially projecting collar (20); 1) is engaged with the annular groove (22) provided in the motor casing (10). , having a longitudinal slit (23) in the region of the collar, and the clamping device (24; 124; 224) in the transverse direction with respect to the longitudinal slit (23). It has an extending tensioning screw (26), which tensioning screw is engaged by the tensioning lever (19). It can be screwed into the thread (28) with the The achieved casing area reduces the width of the longitudinal slit (23). 2. The electric hand-held machine tool of claim 1, wherein the electric hand-held machine tool is accessible towards each other. 3. The connection between the tension screw (26) and the tension lever (19) is a tooth coupling. (30), said tooth coupling being formed by said tensioning lever (19). 3. The electric hand-held tool according to claim 2, wherein the electric hand-held tool is releasable by an axial movement of the machine. 4. A first coupling part (31) of the tooth coupling (30) It is coupled to the fixed screw (26) in a relatively unrotatable manner, and is coupled to the tension lever (19). a second coupling portion (32) non-rotatably coupled to said first cup; coaxially surrounding the ring part (31) and said second coupling part ( 32) and a radial support shoulder provided on said first coupling part (31). (36) to cause engagement between both coupling parts (31, 32). A compression spring (38) is supported and provided on said tooth coupling (30). The axial length of the coupling teeth (34) that mesh with each other inwardly and outwardly, and the compression spring. The contact lengths of the springs (38) are matched to each other, in which case the compression springs (38) said second coupling part (32) is moved in the axial direction against the return force of The cups provided on both coupling parts (31, 32) 4. The ring tooth (34) according to claim 3, wherein the ring teeth (34) are disengaged. Electric handheld machine tool. 5. The locking device (40; 140) is shifted by a predetermined rotation angle and the motor At least two locking grooves (44, 45, 46; arranged in the casing (10); 144, 145, 146) and a locking protrusion that can pivot on the shell casing (20). (47; 147), and the locking projection has the locking groove (44, 45, 4 6; 144, 145, 146) in a form-locking manner. The electric hand-held device according to any one of claims 2 to 4, which is adapted to type machine tool. 6. a cup in which the locking projection (47) coaxially surrounds the tightening screw (26); It is attached to the ring sleeve (29) in a relatively unrotatable manner, and the coupling sleeve a second coupling portion (32) of said tooth coupling (30). operatively coupled via a coupling (50), the cup of the pawl coupling being The pulling part (32) is arranged so that the pulling part (32) Even when the tooth coupling (30) is uncoupled, they remain engaged with each other. 6. The electric handheld device of claim 5, wherein the pawl coupling is configured as a sea urchin. Machine Tools. 7. Each locking groove (44, 45, 46) extends radially from the motor casing (10). It is molded into a casing pin (41, 42, 43) that protrudes inside. At least two casing pins (41, 42, 43) have an arcuate web (5 2), the webs being connected to each other by means of the pivoting projection (47). 7. The electric hand-held machine tool of claim 6, wherein the electric hand-held machine tool is arranged to lock the . 8. A second coupling portion (32) of said tooth coupling (30) The tensioning lever is integrally molded with a lever (19), and the tensioning lever is connected to the second cup. extending at right angles to the shell casing (20) and at right angles to the shell casing (20) Electric hand-held power plant according to any one of claims 4 to 7, located in machine tool. 9. The tooth coupling (30) and the pawl coupling (50), respectively. The coupling parts (31, 32) belonging to this are installed in the shell casing (20). The tension screw (26) and the Only the coupling sleeve (29) penetrates inside the shell casing (20) 9. The electric hand-held machine tool according to claim 8. 10. The pivoting movement of the tensioning lever (19) fixes the tensioning position and the locking position. 10. The electric motor according to claim 8 or 9, wherein the electric motor is limited by a stop (51). Hand-held machine tool. 11. The locking protrusion (147) is rotatably held on the shell casing (20). The locking lever (57) is attached to the locking lever (57) so that it cannot rotate relative to the locking lever (57). 7) the locking protrusion (147) into the locking groove (144, 145, 146); is loaded by a bending spring (60) in the direction of inward pivoting of the locking lever. (57) for the purpose of manually operating the bending spring (60) against the spring force of the bending spring (60). 6. The locking lever projects substantially from the shell casing (20). electric hand-held machine tool. 12. The hand grip (12) is spaced apart from the switch strip (18). It has a yoke (16) that straddles the hand grip (16), which yoke advantageously extends over the hand grip (16). 12), and the locking lever (57) is integrally formed with the yoke (16). and a notch provided in the yoke (16) on the operation surface (59). 12. The electric hand-held machine tool of claim 11, projecting from (61). 13. At least two locking grooves (144, 145, 146) are provided on the motor casing. The electric hand-held tool according to claim 12, wherein the electric hand-held tool is arranged on the outer peripheral surface of the tool (10). machine. 14. The clamping device (124) has a diameter relative to the locking device (140). Electric hand-held machine tool according to claim 12 or 13, which is arranged in the direction of . 15. A stopper protrusion (55) is arranged on the motor casing (10), and At least one stopper projection (53, 54) cooperating with the stopper projection is attached to the shell. The stopper protrusions (55, 53, 54) ) come into contact with each other, the locking protrusion (47; 1) of the locking device (40; 140) 47) and one of the locking grooves (44, 45, 46; 144, 15, 146) 5. The stopper protrusions are arranged relative to each other so as to be aligned. The electric hand-held machine tool according to any one of items 1 to 14. 16. The connection between the tension screw (26) and the tension repper (19) is a coupling. The coupling release member (65) is formed via a coupling release member (65), and the coupling release member is is coupled to the tensioning lever (216) via a toothed coupling (230). and on the other hand is connected to the tension screw (26) via a pawl coupling (250). and the toothed coupling (230) is connected to the coupling release member (230). 65), wherein the electric hand-held device according to claim 2 is releasable by an axial movement of 65). Machine Tools. 17. The tensioning lever (216) attaches the tensioning screw to the shell casing (20). (26) and coaxially attaches said tightening screw (26). is connected in a relatively unrotatable manner to a coupling sleeve (229) surrounding the coupling sleeve (229); A coupling sleeve comprises one ring gear of said tooth coupling (230). and the coupling release member (65) includes a mushroom-shaped grip (66). the pawl coupling (25); 0), the free end of said tensioning screw (26) forming one coupling part of axially surrounding the decoupling member; forming the other coupling part of the coupling (250); It supports the other ring gear of the toothed coupling (230), and The support shoulder (37) provided on the ring release member (65) and the pawl coupling The end of said tensioning screw (26) forming the other coupling part of (250) between said tooth coupling (230) and a supporting shoulder (36) provided on said tooth coupling (230); A compression spring (38) is supported that causes meshing of both ring gears. The axial direction of the coupling teeth that mesh internally and externally with each other in the toothed coupling (230) The length and the tight length of the compression spring (38) are matched to each other, and the compression spring (38) The coupling release member (65) is moved in the axial direction against the return force of the spring (38). of the coupling teeth of said tooth coupling (230) by being moved. 17. Electric hand-held device according to claim 16, adapted to be disengaged. Machine Tools. 18. The locking device (240) is shifted by a predetermined rotation angle to lock the motor case. At least two locking grooves (244, 245, 246 arranged in the thing (10) ) and a locking projection (247), which is advantageously arranged integrally with said tensioning lever (216). ), and the locking protrusion is located on the other side of the locking groove (244, 245, 246). 18. The electrical components of claim 17, adapted to be positively engaged with each other. hand-held machine tool. 19. The tension lever straddles the switch strip (18) at intervals. The yoke is configured as a yoke with an end far from the pivot point. , lockable to the hand grip (12) by a snap fastener (64). The electric hand-held machine tool according to claim 18. 20. The locking groove (244, 245, 246) and the locking protrusion (247), One contact element (71, 72, 70) of each breaking contact (69) is arranged and the breaking contact is operable by a switch strip (18). Connected to the electrical connection between the on/off switch and the electrical drive , the locking protrusion (247) is pivoted into the locking groove (244, 245, 246). 5. The breaking contact is configured to close only when the The electric hand-held machine tool according to any one of items 1 to 19. 21. Two contact springs (7 1, 72), and both contact springs are spaced apart and facing each other. They are located in opposition to each other, and one of the contact springs The spring is connected to the first bayonet contact (74) and the other contact the first spring is connected to the second plug contact (75); The plug-in contact (74) has an on-off switch configured as a two-pole switch. The output pole of the switch (68) is followed by the second plug contact (75). ), one current brush of the electric drive device is connected to the locking protrusion. (247) has contact bridges on two mutually opposite sides. (70) supporting a contact surface coupled via (70), the contact surface comprising: Locking of the locking protrusion (247) in the locking groove (244, 245, 246) in such a position that it comes into contact with both the contact springs (71, 72). 21. The electric hand-held machine tool according to claim 20.